Currently playing(very slowly at that, yay laziness) my dark/dark/soul controller. Wanna get them past 50+1 for once before I get bored as it's pretty fun to play.
I don't remember much but one thing I fondly remember was leveling many alts during Christmas with the Winter Lords in Atlas. Man, a noob PLing was such a mistake. Still got to try many builds(man, Ice/mace tank back then was horrid)
Hm, think next year's Banner/Zombie event could use some incentive. Barely anyone does them(in my experience on Excelsior) after the first couple days.
Kinetic Melee
Mastermind pets(just make all pets scale with level, the level difference just doesn't work out tbh)
Mercenaries and Beasts, maybe ninjas